\tracingonline=2
\tracingcommands=2
\tracingmacros=2
\tracingrestores=2

\catcode`{=1
\catcode`}=2
\catcode`$=3
\catcode`#=6
\catcode`@=11

\vrule width 10pt height 20em depth 30sp
\vrule height 10pt depth 20em width 30sp
\vrule height 10pt height 50em depth 20em width 30sp

\hrule width 10pt height 20em depth 30sp
\hrule height 10pt depth 20em width 30sp
\hrule height 10pt height 50em depth 20em width 30sp

\vrule
\vrule width 10pt
\vrule height 10pt
\vrule height 10pt depth 20em

\hrule
\hrule width 10pt
\hrule height 10pt
\hrule height 10pt depth 20em

\end


